ASTM Black Carbon Square Steel Pipe

Black Square Pipe is a kind of equilateral and non-equilateral steel pipe, which can be subdivided into square pipe and Rectangular Pipe. This is because the area of the side street is different. A square is a square tube, and a rectangular is a Rectangular Tube. In use, the two kinds of steel pipes are also different. Square pipe is used for construction, machinery manufacturing, iron and steel construction and other projects, rectangular pipe is used for conveying fluids, such as oil, natural gas, water, gas, steam and so on.

Black square tubes will corrode when placed in air, as the oxides formed by heating may have a significant effect on pitting resistance. Hot-Dip Galvanized square tube with microstructure plays an important role in pitting resistance of the alloy. Various phases, such as sulfide inclusions and 3-ferrites. Phase, sensitized grain boundary and weld may have a decisive effect on the pitting resistance of steel, and they are all sensitive sites for pitting corrosion.